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New Multistage-Compatible 16-Cell Lithium-Ion Battery Monitoring LSI

Mar 19, 2015

LAPIS Semiconductor, a ROHM Group company, has recently announced the development of a lithium-ion battery monitoring LSI that supports an industry-best 16 cells in series, significantly reducing the size of lithium-ion battery monitoring systems (i.e. power storage systems).

The ML5239 facilitates multi-cell monitoring and allows for multi-stage series connection to support higher voltage lithium-ion battery monitoring systems requiring more than 16 cells. In addition, current consumption during power down has been minimized to an industry-low 0.1µA, effectively reducing system power consumption.

A comprehensive support system is offered, including evaluation board and sample software that make it easy to verify operation, along with manuals and tools that can be downloaded from our website (registration required).

High-density lithium-ion batteries, which have already been widely adopted in household power storage systems and uninterruptible power systems (UPSs), are expected to see increased demand with the proliferation of smart homes and HEMSs (Home Energy Management Systems). However, these applications require much greater battery capacities than those used for portable electronics or electric tools, necessitating battery monitoring solutions that supports multi-stage connection and higher voltages. It is also important that battery monitoring systems consume minimal current in order to ensure efficient operation in various power-sensitive applications such as emergency power supplies.

To meet these needs, LAPIS Semiconductor has developed a battery monitoring LSI optimized for high voltage lithium-ion battery monitoring systems utilizing market-proven mixed signal circuit and high-voltage processes. And going forward LAPIS Semiconductor will continue to respond to the demands of the industrial equipment market for higher voltage battery monitoring systems by offering novel multi-cell lithium-ion battery monitoring LSIs that support even greater voltages.

LAPIS Semiconductor Initiatives for the Secondary Lithium-Ion Battery Market

LAPIS Semiconductor Microcontroller Series

Contributing to Smaller, Lower Power Consumption Battery Monitoring Systems

LAPIS Semiconductor Microcontroller Series

*(1) to (4) in the above diagram correspond with features 1 to 4 below, respectively

Key Features
  • Supports up to 16 cells in series
    • The ML5239 is designed for lithium-ion battery monitoring systems utilizing up to 16 cells in series.
      And class-leading 80V withstand voltage makes it possible to configure higher voltage systems.

  • Enables multi-stage series connection
    • In addition to simplifying multi-cell battery monitoring, multiple LSIs can be connected in series to accommodate higher voltage systems.

  • Minimizes current consumption during power-down
    • Current consumption is reduced to an industry-best 0.1µA during power down, decreasing system power consumption considerably.
      This is particularly effective for systems with long monitoring intervals.

  • Integrated A/D converter
    • Measured values are digitized by the built-in A/D converter and output via SPI, making it possible to construct simple, noise-resistant battery monitoring systems.


  • Power storage systems, uninterruptible power supplies (UPS)

Sales Plan

  • Part No : ML5239
  • Sample Shipment Period : Ongoing
  • Sample Price (Ref.) : $ 11.40 (tax not included)
  • Mass Production Shipment (Est.) : From May 2015
  • Production Qty. : 20k pcs/month


Parameter Specifications
No. of Cells Supported 16 cells (in series) (Scalable via multi-stage series connection)
Power Down Current Consumption 0.1µA (typ.)
Integrated A/D Converter 12bit successive approximation type ADC
Cell Voltage Measurement Accuracy ±10mV (typ.)
Cell Balancing Function Built-in external NMOSFET drive circuit
Temperature Sensor Measurement Function Thermistor connection pin (4ch)
Self-Diagnostic Function Cell voltage measurement open/short detection pin, etc.
MCU Interface SPI serial interface
(CRC communication error detection function)
Operating Power Supply Voltage Range +10 to +72V
Operating Temperature Range -40 to 85°C
Package TQFP64 (12mm × 12mm)


For customers' inquiry regarding this release: please go to   the inquiry page

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